I thought so too. But after reading the article, it's clear that it's still a lab scale method. But Xnormal points out the right thing, if we think of scaling up on solar, it's gonna be difficult. But if it's nuclear, it should be fine.

Would the anonymous downvoter care to calculate the area that would need to be covered with solar receivers to match current world steel production with this process? It's about as energy intensive as aluminum production.

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